freightliner Custom Classic MT45 2022 Maintenance Manual page 47

Engine Cooling/Radiator
engine speed to 1200 rpm for 60 seconds, then
decrease engine speed to low idle for 60 sec-
onds. Top off the coolant level to the base of the
radiator fill neck. Install the radiator cap. Fill the
coolant overflow bottle to the COLD MAX line.
Install the cap on the overflow bottle. Shut down
the engine.
20–02 Cooling Fan Inspection
WARNING
Never pull or pry on the fan. This can damage the
fan blade(s) and cause fan failure. Fan failure can
cause personal injury.
A visual inspection of the cooling fan is required
daily. Check for cracks, loose rivets, and bent or
loose blades. Check the fan to make sure that it is
securely mounted. Tighten the capscrews if neces-
sary. Replace any fan that is damaged. Also check
the fan recirculation shield, if so equipped.
20–03 Coolant Heater Check,
Webasto
1. Using compressed air, clean any accumulated
debris or dust from the heater and enclosure
box. Inspect all components for wear or damage.
2. Check that the batteries are in good condition. If
the voltage is too low or too high, the heater will
automatically shut down. Check the wiring har-
nesses for damage. Replace the harnesses if
necessary.
3. Check the air intake port for obstructions. Care-
fully check the air intake tube for any restrictions
or damage, and repair or replace the tube if nec-
essary.
4. Check the exhaust system for restrictions or cor-
rosion. Replace any damaged parts.
5. Change the fuel filter, if so equipped. Inspect the
fuel line for damage, restrictions, or loose con-
nections. Repair or replace the line if it is dam-
aged.
6. Inspect all coolant lines and clamps for leakage,
restrictions, or damage. Replace the lines as
Walk-In Van Chassis Maintenance Manual, January 2022
needed. Inspect the coolant circulation pump for
leakage. Repair or replace the pump if it is dam-
aged.
7. Run the heater at least once a month for 10 min-
utes.
8. Check the water and fuel connections for leak-
age. Tighten the hose clamps if needed.
20–04 Coolant Replacement,
Electric Vehicle
WARNING
Do not remove or loosen the radiator cap until the
motor and cooling system have completely
cooled. Use extreme care when removing the cap.
A sudden release of pressure from removing the
cap prior to the system cooling can result in a
surge of scalding coolant that could cause seri-
ous personal injury.
1. Remove the fill cap from the surge tank. See
Fig. 2.
1
10/15/2021
1. Powertrain/Battery Loop Surge Tank
Fig. 2, Surge Tank
2. Place a large container under the radiator.
3. Open the drain valve at the bottom of the radia-
tor. See Fig. 3.
4. Locate the petcock valves under the center of
the cab and open the valves to drain the coolant
faster. See Fig. 4.
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